Autocomplete box

i would like to have autocomplete functionality to be enabled when the user presses ctrl-k on the autocomplete box. Can i use Autocomplete box to achieve this functionality.

I had captured key up event , get the data to be displayed in pop-up , bind to the item source of autocomplete box. After populating itemsource i had called populate complete method. But i can't see the pop-up. Have i missed out any attributes to enable
the display of pop-up.